The potential benefits of using the Nonlinear Disturbance (NLD) equations, which govern flow variable fluctuations about an estimated mean, for the large-eddy simulation (LES) of wall bounded shear flows are investigated in this paper. In addition to verifying the suitability of the NLD equations for wall bounded flows, we build upon its advantages by introducing a new wall model that is easily and efficiently implemented within ...
A spatial stability analysis is performed for the boundary layer over a non-isotropic compliant surface. A spectral approximation is used to obtain a solution of the equations governing the normal velocity component of a small disturbance. The streamwise wavenumber becomes the eigenvalue in the nonlinear eigenvalue problem formed. The resulting solution spectrum contains values which indicate the growth rates of the Tollmien-Schlichting and flow-induced surface instabilities. It is shown that ...
This paper considers the flow past a flat plate. When the flow is uniform the Blasius boundary layer forms on the plate. Herein the usual uniform free stream is perturbed by a small amplitude field of random three-dimensional turbulence. Using a numerical technique the statistical response in the boundary layer due to the turbulence in the free stream is computed in terms of auto- and cross-correlation functions. The field variables ...
This volume discusses (1) turbulent mixing noise tests and observations relative to effects of temperature and Mach number on intensity, directivity, and spectra; (2) numerical solutions of the Lilley theory for sound radiated from point sources simulating small-scale turbulence noise sources, and comparisons of these solutions with experimental data relating to temperature and velocity effects on directivity and spectra; (3) the theory describing the development of the large-scale coherent motion ...
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